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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables)
6 Months Ended
Jun. 30, 2021
Accrual for Environmental Loss Contingencies Disclosure [Abstract]  
Schedule of environmental liabilities, current and non-current
(Dollars in millions)June 30, 2021December 31, 2020
Environmental contingencies, current$15 $15 
Environmental contingencies, long-term271 270 
Total$286 $285 
Schedule of changes to environmental remediation liabilities Changes in the reserves for environmental remediation liabilities during first six months 2021 and full year 2020 are summarized below:
(Dollars in millions)Environmental Remediation Liabilities
Balance at December 31, 2019$260 
Changes in estimates recognized in earnings and other
Cash reductions(10)
Balance at December 31, 2020257 
Changes in estimates recognized in earnings and other
Cash reductions(6)
Balance at June 30, 2021$258